Initial data commit

Task/Longest-common-substring/D/longest-common-substring.d

@@ -0,0 +1,31 @@
+import std.stdio;
+
+string lcs(string a, string b) {
+    int[][] lengths;
+    lengths.length = a.length;
+    for (int i=0; i<a.length; i++) {
+        lengths[i].length = b.length;
+    }
+
+    int greatestLength;
+    string output;
+    for (int i=0; i<a.length; i++) {
+        for (int j=0; j<b.length; j++) {
+            if (a[i]==b[j]) {
+                lengths[i][j] = i==0 || j==0 ? 1 : lengths[i-1][j-1] + 1;
+                if (lengths[i][j] > greatestLength) {
+                    greatestLength = lengths[i][j];
+                    int start = i-greatestLength+1;
+                    output = a[start..start+greatestLength];
+                }
+            } else {
+                lengths[i][j] = 0;
+            }
+        }
+    }
+    return output;
+}
+
+void main() {
+    writeln(lcs("testing123testing", "thisisatest"));
+}